Pencil-sharpening machine



Jah. 6, T931. A. P. M. GUHL 1,738,347

PENCILv SHARPENING MACHINE Filed Nov. 11, 1929 y @naamw/gitane),

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l PatentedL Janes, 1931 UNITE STATES viAfrlizlSJ-*l OFFICE nDoLrir PAULMARTIN GURL, F Matutina, GERMANY rENGIL-SHARPENING MACHINE Y Applicationfiled November 11., 1929, Serial No. 406,300, and in Germany December13, 1928.l

My invention relates to machines for sharpening pencils such as lead,chalk, slate and other pencils and crayons of that type in which bothcutter and pencill holder are mechanically rotatedl during thesharpening process. l

The principal obj ect of this invention is to provide an improvedqpencilsharpening machine ofthe type setforth having a gage i3 mechanism ofsimple design which is adapted to automatically stop the travelof thepencil towards the rotary cutter after the pencil has beensharpenedto'tlie desired degree.

The invention further `aims at thus designing the gage mechanismconcerned that it can be adjusted and reset at a moments notice so as tocontrol the formation of either a longer and sharper or of a shorter andbroader pencil point. v

Other objects of the invention will incidentally appear hereinafter.

The nature and scope of the invention are briefly outlined in theappended claims and will be more fully understood by the follow'- ingspeciiicatiomtaken togetherwith the accompanying drawing, in which: i

Fig.v 1 is a side elevation showing the principal structural features ofthe improved pencil sharpening machine by way of an eX- .-20 ample,

Fig. 2 is a plan of the machine,

Fig. is another plan showing the gaging mechanism in a larger scale, l

Fig. 4 is a cross section on line 4 4 in -135 Fig. 1,

Fig. 5 is a front elevation partly in section along line 5-5 in Fig. 1.

On the frame of the pencil sharpening machine a. shaft 1 is rotatablymounted having attached at one end a hand driven crownv a carriage 7which is slidably mounted on the shaft 1 and laterally engages the guidebar 1 1 by means of upright lugs 12, 12'.

On standards provided at the upper part` llink 26 'will move laterally,viz., towards VA chuck 8, adapted tohold the pencil 17 at its rear endAand to rotate. the saine,` is rotatably mounted on thecarriage 7, saidchuck having a pinion 10 attached to it 'which gears with another pinion9, the latter being J. slid'ably'mountedon and rotated by shaft". 1 andakey 1a, asindicated in the Figs. 4 and 5. Y y

By moving the carriage? along shaft 1 the pencil 17 is driven aheadtowards the cutter 5 and sharpened by thelatter. The carriage 7 isadapted to be pushed forward by the operator of the machine, whoembraces with one or more lfingers one of the studs 11a,

projecting from the `top of guide barll, and,

keeps another ingeror thumb gently pressed.

against thelug 25 attherear end of carriage 7. 1

. The front end Lof the pencil 17 whilebeing rotated and sharpened isheld by a guide. block 14 having a conical bore hole and af.slotsthrough which` the sharpened'section of ythe pencil laterallyprojects intolthe range of the cutter 5.

According to this invention a gage inech-` anismis provided forautomatically termi' .nating the advancement of the.l pencil andincidentally the cutting operation, said mechanism comprising thefollowing` structural elements: f

A lever 18 ishinged at the right endfof vthe machine frame near the handwheel .2 and cutter 5, said lever having a gage or stop member 15pivotally attached to it, which is adapted to be thrown by handle v15er.into the path of the pencil.' (Fig. 5), the point of whichwilleventually come into contact with' the opposedfaceoffthe stop15 andin turn swing aside lever 18.

As seen in Fig.y 3 .lever 18 is cooperatively connected through a link26 withy a. toothed rack 20.haying guide slots 21 obliquely arrangedthereinand being slidaloly mounted n at the lower side 0f rail 11 bymeans of studs 22 and a spiral spring 24. l

It will be noted that by reason of the oblique disposition of the guideslots 21 .tooth-rack 2O on being pulled to the right against the actioncf spring 24 by lever 18 and a tooth 23 projecting from and fined on theof pencil sharpening machines and'zin ther 15 cooperation of theircoinponentparts as described ahove, Without sucstantially'departing'from the scope of the lappended,claims and deviatin` *from thespirit'andtlie funda- Tmental ideas of thisinvention. f Y I E.g.,.another gage or stop 'i6 inay'he -prelvidedat A.the handle 15a or on:the 'stop i5 lproper in staggered (advanced) position to the latter, ashost seen in Figs. 3 and 5 so as to vpresent a second-contact'memberwhich 25 nlayhe alternatively throivn into fthe-path of travel of theVlpencil. hytheihandle 15a-- instead otstop l-in cases when a shorter andbroader point on the pencil is required. The 'handle '15a may be adaptedtc 'be 3o swung backward so as to throwfout- :otoperation both stopsland l@ land may rested automatically on reaching its =respective.operative and inoperative positions,-esg., hy "lugs A18a projectingfrom v'the `upright 'ss'section .of/lever 18, as indicated in Figs. v 0nwithdrawing the -`sharpened pencil the toothedrack Q0 Willreturnintolitsinopera- 'said toothed rack, adapted to be controlled vloyvthe pencil point. f

`3. In a pencil-sharpening machine of the type comprising a stationarilymounted rotary cutterandl a slidaloly` mounted pencil holder which bothare mechanicallyv rotated duringsfthe 'sharpening process, a gaging A'mechanism cooperatively Iconnected with the v'pencil-holder and adaptedto automatically lock .thee-,latter on its travel towards the rotarylcutter after 'the' pencil has been wsha-rpcned,said gaging mechanism.comprising a toothed rack slidably mounted and :adapted 't'o Ahe :movedAlaterally -'toward the pencil holder, a locking element provided "onthepencil holder'an'd adapted lto heengagedloy fthe -said toothed rack :andJmeans tor ,iac'tuatingsaid toothed rack, adapted to alinlranda'springyanfda stop member pivotally attached Eto -said'lever fand'adaptedto ihe throw-n into the path of travel fotitfhe `'pencil-point.

"In testimony'whereof I ailixlinyl signature.

n; innert-N Ivtive positionfloy thelaction of spring thus unlockingcarriage 7.

`VVhatl claim isz-- Y p 1. In a pencil-sharpening machineof the `typecomprising Va rstationarily mounted rotary cutter vand a'slidably'-mounted pencil Aholder Which `are mechanically rotated dur-A.ing the sharpening process, afgaging mechanismcooperatively connectedivitht'he pencil holder, and means controlled'therebyto automaticallylock `the-latter onits'f'travel to- Wards vthe -rotary Vcutter after the`pencil h'as been sharpened; 1

V2. In ahpencil-sharpening machine'offthe type comprising a stationarilymounted fro- 'tary 'cutter and a slidahly mounted pencil holder which.are mechanically rotated dur- 'ing the sharpening process, agaging'inechanism cooperatively connected Withthe'pencil holderandadapte'd to automatically vlock lthe latter on its rtravel towardsthe Vrotary cutter after the pencil has been sharpened, ce saidgagingmechanism ,comprising ,a toothed yrack slidably mounted and adapted tobe moved laterally toward the pencil holder,

a locking element provided on Vthel pencil holder and adapted to -loeengagedhy kthe c5 said toothed rack, "and Vmeans for actuating enf.,

